Ohm 8 (oz609)

About this Plan

8 Ohm (or Ohm8). Vic Smeed RC sport biplane design.

Quote: "OHM 8 was designed as a fairly stuntable but beefy and easy to fly trainer for basic multi installations. Twin Triple, Galloping Ghost, and similar equipment. With Twin Triple the actuator system can be used as intended, ie with torque-rod rudder, push-pull elevator, and blipped engine control via a Rising clockwork or similar escapement. Ghost gear is easy to accommodate, and almost any multi equipment weighing up to about 13 oz. can be fitted, which gives scope for the three basic controls - rudder, engine, and elevator - on most six-channel gear.

The prototype, with four channel Grundig gear using hefty dry batteries for servos, came out at 3 lb, 7 oz total, of which 17 oz was radio weight. At this weight the OS Max 15 III fitted produced quite a rapid climb on full throttle.

One of the most satisfying things about the model was the fact that it flew off the board, the only modification needed being an extra degree of down-thrust to iron out a tendency to 'climb stairs' at full throttle; the drawing has incorporated this minor change. Stability is just about right, and it would be quite safe to use rudder-only gear if a little prudence was used to feel the characteristics out on the first flight or two.

Space for equipment is no problem - the fuselage is positively voluminous - but the heavier items should be stowed low. Strength is considerable; initial flights were made with the throttle control reversed, and the second flight iinshed up with a vertical dive in (following an open-up when a full close-down had been intended!) with no damage to speak of..."

Supplementary file notes

Article pages, text and pics, thanks to AugustaWest

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